72750001 has 2 divisors, whose sum is σ = 72750002. Its totient is φ = 72750000.

The previous prime is 72749981. The next prime is 72750061. The reversal of 72750001 is 10005727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61701025 + 11048976 = 7855^2 + 3324^2 .

It is an emirp because it is prime and its reverse (10005727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72750001 - 2⁵ = 72749969 is a prime.

It is not a weakly prime, because it can be changed into another prime (72750061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36375000 + 36375001.

It is an arithmetic number, because the mean of its divisors is an integer number (36375001).

Almost surely, 2^72750001 is an apocalyptic number.

It is an amenable number.

72750001 is a deficient number, since it is larger than the sum of its proper divisors (1).

72750001 is an equidigital number, since it uses as much as digits as its factorization.

72750001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 72750001 is about 8529.3611132370. The cubic root of 72750001 is about 417.4562823694.

Adding to 72750001 its reverse (10005727), we get a palindrome (82755728).

The spelling of 72750001 in words is "seventy-two million, seven hundred fifty thousand, one".